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| author | Hugh Dickins <hughd@google.com> | 2011-05-09 17:44:42 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-09 17:52:17 -0700 |
| commit | 42c36f63ac1366ab0ecc2d5717821362c259f517 (patch) | |
| tree | 1b711b7f5c1f486a07289edb43db4f99f05d6e5a /mm/mmap.c | |
| parent | c191f6ccee11b79fb562c36007a5af31c705c9e2 (diff) | |
| download | lwn-42c36f63ac1366ab0ecc2d5717821362c259f517.tar.gz lwn-42c36f63ac1366ab0ecc2d5717821362c259f517.zip | |
vm: fix vm_pgoff wrap in upward expansion
Commit a626ca6a6564 ("vm: fix vm_pgoff wrap in stack expansion") fixed
the case of an expanding mapping causing vm_pgoff wrapping when you had
downward stack expansion. But there was another case where IA64 and
PA-RISC expand mappings: upward expansion.
This fixes that case too.
Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mmap.c')
| -rw-r--r-- | mm/mmap.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/mm/mmap.c b/mm/mmap.c index e27e0cf0de03..772140c53ab1 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1767,10 +1767,13 @@ int expand_upwards(struct vm_area_struct *vma, unsigned long address) size = address - vma->vm_start; grow = (address - vma->vm_end) >> PAGE_SHIFT; - error = acct_stack_growth(vma, size, grow); - if (!error) { - vma->vm_end = address; - perf_event_mmap(vma); + error = -ENOMEM; + if (vma->vm_pgoff + (size >> PAGE_SHIFT) >= vma->vm_pgoff) { + error = acct_stack_growth(vma, size, grow); + if (!error) { + vma->vm_end = address; + perf_event_mmap(vma); + } } } vma_unlock_anon_vma(vma); |